56510911 has 4 divisors (see below), whose sum is σ = 56942424. Its totient is φ = 56079400.

The previous prime is 56510899. The next prime is 56510917. The reversal of 56510911 is 11901565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56510911 - 2¹⁵ = 56478143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56510911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56510917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215560 + ... + 215821.

It is an arithmetic number, because the mean of its divisors is an integer number (14235606).

Almost surely, 2^56510911 is an apocalyptic number.

56510911 is a deficient number, since it is larger than the sum of its proper divisors (431513).

56510911 is a wasteful number, since it uses less digits than its factorization.

56510911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431512.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 56510911 is about 7517.3739430735. The cubic root of 56510911 is about 383.7462131497.

It can be divided in two parts, 565 and 10911, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 56510911 in words is "fifty-six million, five hundred ten thousand, nine hundred eleven".